Fig. 1. Photograph of a section of the subarcualis rectus posterior (SARP) muscle of Hydromantes imperialis from two perspectives (A) medial, (B) lateral. The portion of the muscle in the center of each photo has been partially dissected to illustrate the complex arrangement of muscle fibers and the position of the epibranchial cartilage (arrow) in the lumen. Scale bar, 1 mm.